1. After removing roast from roasting pan, pour drippings into large glass measuring cup. Skim off fat; discard. Add beef broth, Merlot wine, Worcestershire sauce to drippings. Pour mixture back into pan. Heat and stir over medium heat until bubbly, scraping up crusty brown bits from bottom of the pan. If desired, for a thicker au jus, stir together water and cornstarch. Whisk into bubbling broth mixture. If desired, strain au jus before serving.